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Old 03-27-2020, 12:16 PM   #1
Satdiver
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Made a 145cm inverter, 10mm shaft

Had a go at building a of 145cm inverter. Overall length 165cm. 10mm Hunt double offset flopper shaft.
My mate wanted one so built 2 guns.
20mm bands through the back rollers and the rest 19mm bands.
Carbon strips between the laminate to stop the gun flexing.
Two 19mm x 6mm ceramic's bearings in each Delrin rollers.
Titanium stopper tube to reduce weight to help ballast the 1.1kg shaft and 1.6mm coated cable.
Ermes double roller trigger.
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Old 03-27-2020, 01:37 PM   #2
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

Delrin rollers with ceramic bearings
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Old 03-27-2020, 01:40 PM   #3
fredfoes
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Re: Made a 145cm inverter, 10mm shaft

magnificent manufacture,

the mechanism ermes manages to manage all this power?

For the rubbers, you start with which coefficient ?

I am fascinated by this manufacturing
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Old 03-27-2020, 01:55 PM   #4
Behslayer
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Re: Made a 145cm inverter, 10mm shaft

Looks Fantastic! Can you make Pool Test Videos? Why 10mm? Sounds heavy?
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Old 03-27-2020, 02:17 PM   #5
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

Yes the Ermes triggers handles the load easy. The pulleys halve the load to the trigger mechanism.

Last edited by Satdiver; 03-28-2020 at 01:30 AM.
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Old 03-27-2020, 02:23 PM   #6
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

Quote:
Originally Posted by Behslayer View Post
Looks Fantastic! Can you make Pool Test Videos? Why 10mm? Sounds heavy?
This is quite a powerful gun, need a heavier shaft to stop the shaft whipping. Plus get very good penetration.

I have tried to upload video's of pool testing with target and XPS constitution foam that Majd recommended. But cannot.

I tried to contact the Spearboard administer. Email bounces back with this reply.<spearmax@spearboard.com>: host mail.spearboard.com[3.233.33.92] said: 550
Mailbox is full / Blocks limit exceeded / Inode limit exceeded (in reply to
RCPT TO command)

Last edited by Satdiver; 03-27-2020 at 03:57 PM.
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Old 03-27-2020, 03:19 PM   #7
popgun pete
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Re: Made a 145cm inverter, 10mm shaft

Looks like the 20 mm wrap around bands anchor just rearwards of the muzzle nose, so when cocked they occupy both top and bottom decks at full length. Usually we don't see that anchor position so far forwards, but there is no reason not to do it that way if the bands sit in upper troughs as they do here.

Nice looking gun with good woodwork and a 4 band group, just the thing for a 10 mm shaft.

Last edited by popgun pete; 03-28-2020 at 12:11 AM. Reason: left out some words
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Old 03-27-2020, 03:29 PM   #8
Marco
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Re: Made a 145cm inverter, 10mm shaft

Woah! Those beasts look amazingly powerful!

Why don't you upload the videos to Youtube or Vimeo?
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Old 03-27-2020, 03:52 PM   #9
popgun pete
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Re: Made a 145cm inverter, 10mm shaft

Quote:
Originally Posted by Satdiver View Post
This is quite a powerful gun, need a heavier shaft to stop the shaft whipping. Plus get very good penetration.

I have tried to upload video's of pool testing with target and XPS constitution foam that Mjad recommended. But cannot.

I tried to contact the Spearboard administer. Email bounces back with this reply.<spearmax@spearboard.com>: host mail.spearboard.com[3.233.33.92] said: 550
Mailbox is full / Blocks limit exceeded / Inode limit exceeded (in reply to
RCPT TO command)
This site only lets images to be uploaded of a few hundred KB, videos need to be referenced via links to some other site that handles videos.
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Old 03-27-2020, 03:55 PM   #10
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

Quote:
Originally Posted by popgun pete View Post
Looks like the 20 mm wrap around bands anchor just rearwards of the muzzle nose, so when cocked they occupy both top and bottom decks at full length. Usually we don't see that anchor position so far forwards, but there is no reason not to do that if the bands sit in upper troughs as they do here.

Nice looking gun with good woodwork and a 4 band group, just the thing for a 10 mm shaft.
Thanks.
I thought why not use every centimetre of the gun for the band stretch. The shaft speed is extremely fast.
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Old 03-27-2020, 04:12 PM   #11
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

Quote:
Originally Posted by Marco View Post
Woah! Those beasts look amazingly powerful!

Why don't you upload the videos to Youtube or Vimeo?
Ok will try to upload video's to Youtube.

I called the gun Kraken.
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Old 03-27-2020, 04:35 PM   #12
popgun pete
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Re: Made a 145cm inverter, 10mm shaft

Gun weight without and with the shaft?
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Old 03-27-2020, 06:06 PM   #13
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

Quote:
Originally Posted by popgun pete View Post
Gun weight without and with the shaft?
This is the weight without the shaft & bands.
With the 10mm hunt double flopper shaft and 11.2 meters of 1.6mm vinyl coated cable, plus the bands. The gun weighs 5.632kg
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Last edited by Satdiver; 03-27-2020 at 06:17 PM.
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Old 03-27-2020, 06:53 PM   #14
popgun pete
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Re: Made a 145cm inverter, 10mm shaft

3.432 kg is good, you want mass if you are going to shoot heavy shafts which have good hitting power at long range. Seal's 130 (Kosta) weighs 2.5 kg with bands, my Urukay 120 cm weighs 2.57 kg bare.
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Old 03-27-2020, 08:23 PM   #15
SEATUX
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Re: Made a 145cm inverter, 10mm shaft

Beautiful Build!
Gotta ask..
WHAT ARE YOU HUNTING???
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